No, these are not dual ovenable containers. They are made of polypropylene. See http://www.pactiv.com/products_na/newspring/VersaHome.html for more details.
In a 58 oz. box, I’m able to get 30 oz. of cooked spaghetti, 15 meatballs (1 1/2 oz. ea), 15 fl. oz. of sauce, and 3 3/4 oz. of mozzarella...